RE: [Vo]:"Paramagnons" - new way to convert heat into electrical energy--what is the physics of the Bose magnons--
The reference links make note of Bose magnons as being important in the phenomena of spin cliometrics. It may be that neutrino spin is involved in creating the Bose particles with no net spin. (It may be a combination of a positrons, electrons and a neutrino or more. Bob Cook From: bobcook39...@hotmail.com Sent: Monday, September 30, 2019 10:35:30 AM To: vortex-l@eskimo.com Subject: RE: [Vo]:"Paramagnons" - new way to convert heat into electrical energy Jones― Nice work I note that the Li doping is an important design feature in Mn-Te materials used for conversion of phonic lattice energy to electrical potential across a macroscopic lattice. Rossi may have stumbled on this effect in his reactor. The question is: What is the differential temperature needed to sap off the enthalpy in the lattice in significant quantity to be practical. Bob Cook From: JonesBeene Sent: Monday, September 30, 2019 9:50:09 AM To: vortex-l@eskimo.com Subject: [Vo]:"Paramagnons" - new way to convert heat into electrical energy “Paramagnon drag in high thermoelectric figure of merit Li-doped MnTe” (manganese telluride) Zheng et al Science Advances 13 Sep 2019 Vol. 5, no. 9 DOI: 10.1126/sciadv.aat9461 https://advances.sciencemag.org/content/5/9/eaat9461.full Thermoelectricity is generally too inefficient for the obvious application - to put into an automobile exhaust system where one has almost unlimited free megawatts of waste heat. Billions of dollars could be saved with the proper TE material. Magnetocalorics (spin-calorics) could change low expectations, erase past failures and open up a new area of engineering to prolong the lifetime of the ICE and also to retrieve more energy from solar cells and other obvious applications… “Ifonly” higher efficiency is possible at reasonable cost. BTW �C this promising field was one of the first scams of Andrea Rossi. He used tellurides in his abandoned patent application: https://patents.google.com/patent/US20050028858A1/en In fact, tellurides have been tried in TEGs for decades, to no avail. The better ones incorporate a strategy of “point defect<https://www.sciencedirect.com/topics/materials-science/point-defect>” engineering to regulate the electrical and thermal transport. The primary dopants used have been tin an antimony. The power factor is seen to increase with proper doping due to reduction of the band gap. In fact, in the new paper, they claim to open up an entirely new pathway for conversion gain by optimizing the spin-caloric effect. This is novel. This new material could be also used with LENR and possibly the Manelas device - but of course these applications are not mentioned. Bottom line: the new material described in the paper uses Li as a dopant and is said to be a huge breakthrough in efficiency although the required temperature is rather high and many important details are missing. Abstract Local thermal magnetization fluctuations in Li-doped MnTe are found to increase its thermopower α strongly at temperatures up to 900 K. Below the Néel temperature (TN ~ 307 K), MnTe is antiferromagnetic, and magnon drag contributes αmd to the thermopower, which scales as ~T3. Magnon drag persists into the paramagnetic state up to >3 × TN because of long-lived, short-range antiferromagnet-like fluctuations (paramagnons) shown by neutron spectroscopy to exist in the paramagnetic state. The paramagnon lifetime is longer than the charge carrier�Cmagnon interaction time; its spin-spin spatial correlation length is larger than the free-carrier effective Bohr radius and de Broglie wavelength. Thus, to itinerant carriers, paramagnons look like magnons and give a paramagnon-drag thermopower. This contribution results in an optimally doped material having a thermoelectric figure of merit ZT > 1 at T > ~900 K, the first material with a technologically meaningful thermoelectric energy conversion efficiency from a spin-caloritronic effect. A more simplified story: https://www.sciencedaily.com/releases/2019/09/190923111235.htm
RE: [Vo]:"Paramagnons" - new way to convert heat into electrical energy
Jones― Nice work I note that the Li doping is an important design feature in Mn-Te materials used for conversion of phonic lattice energy to electrical potential across a macroscopic lattice. Rossi may have stumbled on this effect in his reactor. The question is: What is the differential temperature needed to sap off the enthalpy in the lattice in significant quantity to be practical. Bob Cook From: JonesBeene Sent: Monday, September 30, 2019 9:50:09 AM To: vortex-l@eskimo.com Subject: [Vo]:"Paramagnons" - new way to convert heat into electrical energy “Paramagnon drag in high thermoelectric figure of merit Li-doped MnTe” (manganese telluride) Zheng et al Science Advances 13 Sep 2019 Vol. 5, no. 9 DOI: 10.1126/sciadv.aat9461 https://advances.sciencemag.org/content/5/9/eaat9461.full Thermoelectricity is generally too inefficient for the obvious application - to put into an automobile exhaust system where one has almost unlimited free megawatts of waste heat. Billions of dollars could be saved with the proper TE material. Magnetocalorics (spin-calorics) could change low expectations, erase past failures and open up a new area of engineering to prolong the lifetime of the ICE and also to retrieve more energy from solar cells and other obvious applications… “Ifonly” higher efficiency is possible at reasonable cost. BTW �C this promising field was one of the first scams of Andrea Rossi. He used tellurides in his abandoned patent application: https://patents.google.com/patent/US20050028858A1/en In fact, tellurides have been tried in TEGs for decades, to no avail. The better ones incorporate a strategy of “point defect<https://www.sciencedirect.com/topics/materials-science/point-defect>” engineering to regulate the electrical and thermal transport. The primary dopants used have been tin an antimony. The power factor is seen to increase with proper doping due to reduction of the band gap. In fact, in the new paper, they claim to open up an entirely new pathway for conversion gain by optimizing the spin-caloric effect. This is novel. This new material could be also used with LENR and possibly the Manelas device - but of course these applications are not mentioned. Bottom line: the new material described in the paper uses Li as a dopant and is said to be a huge breakthrough in efficiency although the required temperature is rather high and many important details are missing. Abstract Local thermal magnetization fluctuations in Li-doped MnTe are found to increase its thermopower α strongly at temperatures up to 900 K. Below the Néel temperature (TN ~ 307 K), MnTe is antiferromagnetic, and magnon drag contributes αmd to the thermopower, which scales as ~T3. Magnon drag persists into the paramagnetic state up to >3 × TN because of long-lived, short-range antiferromagnet-like fluctuations (paramagnons) shown by neutron spectroscopy to exist in the paramagnetic state. The paramagnon lifetime is longer than the charge carrier�Cmagnon interaction time; its spin-spin spatial correlation length is larger than the free-carrier effective Bohr radius and de Broglie wavelength. Thus, to itinerant carriers, paramagnons look like magnons and give a paramagnon-drag thermopower. This contribution results in an optimally doped material having a thermoelectric figure of merit ZT > 1 at T > ~900 K, the first material with a technologically meaningful thermoelectric energy conversion efficiency from a spin-caloritronic effect. A more simplified story: https://www.sciencedaily.com/releases/2019/09/190923111235.htm
[Vo]:"Paramagnons" - new way to convert heat into electrical energy
“Paramagnon drag in high thermoelectric figure of merit Li-doped MnTe” (manganese telluride) Zheng et al Science Advances 13 Sep 2019 Vol. 5, no. 9 DOI: 10.1126/sciadv.aat9461 https://advances.sciencemag.org/content/5/9/eaat9461.full Thermoelectricity is generally too inefficient for the obvious application - to put into an automobile exhaust system where one has almost unlimited free megawatts of waste heat. Billions of dollars could be saved with the proper TE material. Magnetocalorics (spin-calorics) could change low expectations, erase past failures and open up a new area of engineering to prolong the lifetime of the ICE and also to retrieve more energy from solar cells and other obvious applications… “Ifonly” higher efficiency is possible at reasonable cost. BTW – this promising field was one of the first scams of Andrea Rossi. He used tellurides in his abandoned patent application: https://patents.google.com/patent/US20050028858A1/en In fact, tellurides have been tried in TEGs for decades, to no avail. The better ones incorporate a strategy of “point defect” engineering to regulate the electrical and thermal transport. The primary dopants used have been tin an antimony. The power factor is seen to increase with proper doping due to reduction of the band gap. In fact, in the new paper, they claim to open up an entirely new pathway for conversion gain by optimizing the spin-caloric effect. This is novel. This new material could be also used with LENR and possibly the Manelas device - but of course these applications are not mentioned. Bottom line: the new material described in the paper uses Li as a dopant and is said to be a huge breakthrough in efficiency although the required temperature is rather high and many important details are missing. Abstract Local thermal magnetization fluctuations in Li-doped MnTe are found to increase its thermopower α strongly at temperatures up to 900 K. Below the Néel temperature (TN ~ 307 K), MnTe is antiferromagnetic, and magnon drag contributes αmd to the thermopower, which scales as ~T3. Magnon drag persists into the paramagnetic state up to >3 × TN because of long-lived, short-range antiferromagnet-like fluctuations (paramagnons) shown by neutron spectroscopy to exist in the paramagnetic state. The paramagnon lifetime is longer than the charge carrier–magnon interaction time; its spin-spin spatial correlation length is larger than the free-carrier effective Bohr radius and de Broglie wavelength. Thus, to itinerant carriers, paramagnons look like magnons and give a paramagnon-drag thermopower. This contribution results in an optimally doped material having a thermoelectric figure of merit ZT > 1 at T > ~900 K, the first material with a technologically meaningful thermoelectric energy conversion efficiency from a spin-caloritronic effect. A more simplified story: https://www.sciencedaily.com/releases/2019/09/190923111235.htm
